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    A biotype of hare barley (Hordeum leporinum) resistant to paraquat and diquat

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    Date
    1991
    Author
    Tucker, E.S.
    Powles, S.B.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    A biotype of the annual grass weed hare barley infesting an alfalfa field with a 24-yr history of the use of the bipyridylium herbicides paraquat and diquat, was investigated for resistance to these herbicides. Rates of up to 800 g ai ha–1 of each herbicide caused no mortality in the hare barley plants from this field. The same species, collected from an adjacent pasture field with no history of bipyridylium herbicide application, exhibited LD50's of 57 and 160 g ai ha–1 for paraquat and diquat, respectively. Tiller numbers and dry matter production in the biotype from the alfalfa field were not affected by the normal rate recommended for both herbicides. These results clearly show that hare barley from the alfalfa field is resistant to paraquat and diquat. Both biotypes were equally sensitive to fluazifop, glyphosate, and sethoxydim.
    https://doi.org/10.1017/S004317450007140X
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/5901
    Digital Object Identifier (DOI)
    https://doi.org/10.1017/S004317450007140X
    IITA Subjects
    Plant Health; Plant Production; Plant Breeding
    Agrovoc Terms
    Infestation; Herbicides; Mortality; Tillering; Production; Dry Matter; Fluazifop; Glyphosate; Sethoxydim
    Regions
    Acp; Central America
    Countries
    United States
    Collections
    • Journal and Journal Articles4835
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